An 18 Watt (W) LED tube light can replace a 40W general T8 tube light without affecting the illuminance. Hence, electricity saving is more than 64 units per year, considering the light operates for 8 hours per day.

A 6-8 Watt(W) LED can replace a 40W Incandescent light. The reason is a 6-8W LED produces the same light output(Lumen) as a 40 W incandescent light per unit of electricity consumed. Hence, electricity saving is more than 93 units per year, considering the light operates for 8 hours per day.

Light output: Light output per unit of electricity consumed (Lumen per Watt) for an LED is double (120-140 Lumen/W) for that of general T8 Tube Light (60-80 Lumen/W). Hence, for the lower Watt same illumination is possible using LEDs.

Life: LED have a life of more than 50,000 burning hours i.e., 10-15 years. Whereas, T8 Tube lights have a life of 10,000-20,000 burning hours i.e., 3-4 years.